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I wouldn't call them really glossy. I'm trying to get in touch with the person who owns the Roberts to compare notes. I will let provide an update if I get more information. Thanks to everyone who has provided information and has reached out. Because the backs are a little different (redemption information), I guess they could be from 2 different years or series.

I got the cards recently from an antique dealer friend in Pennsylvania. Another antique dealer purchased them in an estate - the cards were stored in an album of antique photographs for 50+ years (it looked like the album/cards were never touched in years). The back of the cards indicate that Mascot Dog Food was out of Philadelphia, not far from where the cards were found. Makes sense to see a Philadelphia Phillies player as the only known example. It would be great to find out more information about how long Mascot Dog Food was in business. Do you think these are so rare because anyone who had them would have sent them in for the great redemption package they offered or because the dog food company may have gone under? Maybe both, and maybe they were limited to begin with. In my research I have not found any cards other than the Roberts in the price guide and I have not found any of those other redemption items. Somewhere there must be information. I did find a couple web blogs where collectors indicated that it is a regional set they'd love to find, so some collectors must know about them. I never thought I would stumble upon a one of a kind Mantle card from the 1950s!

My question is - are these actual cardstock, or are they, as the promo blurb states, "printed on the label." If the "cards" are simply printed on can labels, it's more understandable that collectors would send them in for redemption and thus render them scarcer over time. But, the images of the cards you posted look like usual cardstock, so I'm curious. The puzzle of the number of cards in the issue: 8 vs 11, reminds me of the 1951 Topps Current All-Star set, with three cards with Philadelphia connections withdrawn from publication due to contractual concerns. I wonder if perhaps Mascot had poor sales, leading to early cancellation of the promotion, however, reading the label ingredients, the stuff sounds a lot more nutritious, if not tastier, than some of the MRE stuff I gagged on in the service.

What are the difference in the redemption info. On the backs? Your saying your Mantle and Berra are different from the Roberts or is your Mantle different from your Berra ? These are really interesting !

The berra has the same offer as the roberts the mantle has an offer for 11. they are on a normal card stock, they are not glossy per se but they aren't dull either. They are not on the labels. These are pretty cool and Chuck may have hit the lotto. One of the first "new" things I have seen in years that i could genuinely say was cool.

The berra has the same offer as the roberts the mantle has an offer for 11. they are on a normal card stock, they are not glossy per se but they aren't dull either. They are not on the labels. These are pretty cool and Chuck may have hit the lotto. One of the first "new" things I have seen in years that i could genuinely say was cool.

Thanks for that info, Glyn. I agree that it is a great find. But, I'm still wondering - what does "printed on the labels" refer to then, if the cards are all on cardstock?

From what I have been told they (any known copies)are on card stock as is the roberts from the catalog, according to my source. The individual i immediately sent photos too stated he believes they are authentic. this individual is in my opinion the most knowledgable individual on odd vintage sports cards in the world. I trust his opinion absolutely, as would most who know him. To be honest when i first saw pics my gut said no good but i wasn't positive. my friend has me convinced the other way now and after having seen them i believe they are vintage as well.

It means you get the cards of the stars that are listed on the label. Apparently the checklist was written there so you know who was included.

Yeah, I guess you're right. I was thrown off by the label image that ChuckW posted, thinking it was from the redemption deal, but it was apparently from a non-redemption can. Plus, the ungrammatical wording "photos of stars printed on label."